diff --git a/ktnef/ktnef/CMakeLists.txt b/ktnef/ktnef/CMakeLists.txt
index e356bcea..1bd4912c 100644
--- a/ktnef/ktnef/CMakeLists.txt
+++ b/ktnef/ktnef/CMakeLists.txt
@@ -13,4 +13,4 @@ install( FILES
     ktnefparser.h ktnefattach.h ktnefproperty.h
     ktnefpropertyset.h ktnefmessage.h ktnefwriter.h
     ktnefdefs.h
-  DESTINATION ${INSTALL_INSTALL_DIR}/ktnef )
+  DESTINATION ${INCLUDE_INSTALL_DIR}/ktnef )